I only have my recommendation, would getting a MMIC make a difference at this point?
Not really. But, in the future, it kinda gives you a "get out of jail free" card. However, you may find that your medical provider will not cooperate with the county and state - most in my part of the state actively tell their "clients" NOT to apply for the state card (I suspect, because they know that they are issuing the cards fraudulently and without good cause).
My ticket only says possession of less than one oz, but the location specifies that I was on campus. Can that result in a misdemeanor or should that still be corrected as an infraction?
H&S 11357(b) is the infraction. Unless it is amended to something else, then that is what you will face.
(b) Except as authorized by law, every person who possesses not
more than 28.5 grams of marijuana, other than concentrated cannabis,
is guilty of an infraction punishable by a fine of not more than one
hundred dollars ($100).
Also, will the fact that others in my group were marked as infractions for the same crime help my case? My county is incredibly liberal and Marijuana friendly, so I have high hopes, but I'm still concerned about what could come out of this.
The others' cites are not likely to be considered. The offense IS an infraction, so that should be sufficient for the court to arraign you on the infraction.